135 lines
3.7 KiB
ArmAsm
135 lines
3.7 KiB
ArmAsm
/*
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* Copyright (c) 2011 Aeroflex Gaisler
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*
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* BSD license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <asm-leon/leon.h>
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#include <asm-leon/leonstack.h>
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#include <asm-leon/asmmacro.h>
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.seg "text"
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/* Number of register windows */
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.global _nwindows_min1, _nwindows
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! Window overflow trap handler on save.
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! Touches %g1
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/* ------- */
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.weak _window_overflow
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.set _window_overflow,__window_overflow
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.weak _window_overflow_svt
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.set _window_overflow_svt,__window_overflow_svt
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/* ------- */
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!.global _window_overflow,_window_overflow_svt
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.global __window_overflow_rettseq,__window_overflow_rettseq_ret,__window_overflow_slow1
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__window_overflow_svt:
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__window_overflow:
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#ifndef _FLAT
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__window_overflow_rettseq:
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mov %wim, %l3 ! Calculate next WIM
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mov %g1, %l7
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srl %l3, 1, %g1
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__window_overflow_rettseq_ret:
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sethi %hi(_nwindows_min1), %l4 ! NWINDOWS-1
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ld [%l4+%lo(_nwindows_min1)], %l4
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sll %l3, %l4 , %l4
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or %l4, %g1, %g1
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save ! Get into window to be saved.
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mov %g1, %wim
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nop; nop; nop
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std %l0, [%sp + 0];
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std %l2, [%sp + 8];
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std %l4, [%sp + 16];
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std %l6, [%sp + 24];
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std %i0, [%sp + 32];
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std %i2, [%sp + 40];
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std %i4, [%sp + 48];
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std %i6, [%sp + 56];
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restore ! Go back to trap window.
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mov %l7, %g1
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jmp %l1 ! Re-execute save.
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rett %l2
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nop
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__window_overflow_slow1: ! space for possible stackcheck patch
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nop
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nop
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#else
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ta 0 ! halt
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__window_overflow_rettseq:
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__window_overflow_rettseq_ret:
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__window_overflow_slow1:
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nop
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nop
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nop
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#endif
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/* Window underflow trap handler on restore. */
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! Touches %g1
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/* ------- */
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.weak _window_underflow
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.set _window_underflow,__window_underflow
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.weak _window_underflow_svt
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.set _window_underflow_svt,__window_underflow_svt
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/* ------- */
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!.global _window_underflow,_window_underflow_svt
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__window_underflow_svt:
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__window_underflow:
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#ifndef _FLAT
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mov %wim, %l3 ! Calculate next WIM
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sll %l3, 1, %l4
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sethi %hi(_nwindows_min1), %l5 ! NWINDOWS-1
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ld [%l5+%lo(_nwindows_min1)], %l5
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srl %l3, %l5, %l5
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or %l5, %l4, %l5
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mov %l5, %wim
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nop; nop; nop
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restore ! Two restores to get into the
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restore ! window to restore
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ldd [%sp + 0], %l0; ! Restore window from the stack
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ldd [%sp + 8], %l2;
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ldd [%sp + 16], %l4;
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ldd [%sp + 24], %l6;
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ldd [%sp + 32], %i0;
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ldd [%sp + 40], %i2;
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ldd [%sp + 48], %i4;
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ldd [%sp + 56], %i6;
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save ! Get back to the trap window.
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save
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jmp %l1 ! Re-execute restore.
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rett %l2
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#else
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ta 0 ! halt
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#endif
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